docs: add a section to HACKING.md on PR titles (commit messages to main) #2626

	name: Observability Charm Tests

	on: [push, pull_request, workflow_call]

	jobs:
	o11y-charm-tests:
	runs-on: ubuntu-latest

	strategy:
	fail-fast: false
	matrix:
	include:
	- charm-repo: canonical/alertmanager-k8s-operator
	commit: 90b85c79dfdeeeedcc538c92dcbc26fb2b931088 # rev114 2024-05-23T12:09:22Z
	- charm-repo: canonical/prometheus-k8s-operator
	commit: 41b10003b2e7aba34e26fa387af4297d97ecb535 # rev189 2024-05-21T21:25:20Z
	- charm-repo: canonical/grafana-k8s-operator
	commit: ec74910fc60848594ce44da3b549ad18aa6528aa # rev113 2024-05-21T14:31:49Z
	steps:
	- name: Checkout the ${{ matrix.charm-repo }} repository
	uses: actions/checkout@v4
	with:
	repository: ${{ matrix.charm-repo }}
	ref: ${{ matrix.commit }}

	- name: Update 'ops' dependency in test charm to latest
	run: \|
	sed -i -e "/^ops[ ><=]/d" -e "/canonical\/operator/d" -e "/#egg=ops/d" requirements.txt
	echo -e "\ngit+$GITHUB_SERVER_URL/$GITHUB_REPOSITORY@$GITHUB_SHA#egg=ops" >> requirements.txt

	- name: Install dependencies
	run: pip install tox~=4.2

	- name: Run the charm's unit tests
	run: tox -vve unit

	- name: Run the charm's static analysis checks
	run: tox -vve static-charm

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